I'm not sure if that's what you're looking for but the next version will allow you to play local files with the app. You will then be able to use the app playlist with both podcasts and local files. Another solution might be to crate a virtual podcast. To do so, press the + button to add a podcat and select 'Virtual folder'. Finally select a folder on your device. Then every files within this folder will be detected as 'episodes' and you will be able to listen to them with the app player/playlist